This week's episode is titled "Northwest Passage", where a murder investigation linked to Thomas Newton has Peter helping the local authorities solve these murders. The man from the Other Side also makes an appearance.

This is a very unusual episode of Fringe. Anxiety caused by Peter's disappearance leads Walter to smoke some funky marijuana. Walter then tells Olivia's niece a story, and his imagination becomes the setting for a musical mystery put on by the rest of the Division.

This week's episode is titled "The Man from the Other Side." In it, Newton and his shape-shifter goons are trying to open up a portal into our universe. Peter also learns that he is not from our world, with heartbreaking consequence.

This week's episode has a cool name. It's titled "Olivia. In the Lab. With a Revolver." The Division is puzzled by the death of a woman from a disease she apparently never had. Meanwhile, Olivia struggles to keep the secret about Peter to herself.

This week's episode is titled "Jacksonville." A seismic disaster in Manhattan leads Walter to believe it was somehow related to his experiments with William Bell. Agent Dunham must then unlock her ability to save the lives of many.

Wedding guests are found dead on this week's episode titled "The Bishop Revival." When wedding guests mysteriously die, the unit looks into the crime's connections with one of Walter's old experiments.

This week's episode on Fringe is titled "What Lies Below." During it, there's a lethal virus... and it's spreading. Walter, Broyles and Astrid search for answers when Peter and Olivia become trapped in a Boston office that's been quarantined by the Centers for Disease Control because of this deadly virus.

It's off to a small town this week on Fringe. The episode is titled "Johari Window." The team heads to a secluded small town to investigate a mysterious cover-up involving humans with horrible deformities. How far will the town go to keep their secret?

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Walter thinks that she was a shape-changing soldier from another universe. He thinks that might be where you went. Do you think it's a bad sign that I can say that out loud and neither of us thinks I'm crazy?